First of all, Good Luck!
I had a big down before an up. I took well over 20H to go solo, and decided to pack it all in. I still had a couple of lessons booked, so I went in and flew them just to say goodbye and thanks to the FI. Which I had second thoughts about when I realised the pressure I had just put on him... Anyhow, suddenly, somehow, I could 'see' what was happening in the flare, the terror faded, and I think I knew I was going solo before he did. The rest of the PPL went fine.
Redhill is a nice place, you have ATC tower radio but not much time wasted holding, and some non-standard circuit joins. Navigation in and out is a doddle, though as you say height-holding is important because of Gatwick.
Its runways can get waterlogged in the winter though. I believe there is use of an unlicensed taxiway when that happens, but I don't know if you can train off of that. Best ask first.